Am i Right or is she? x?

My best friend says one day that she thinks of me as a best mate, and the next day she goes I just use you as someone to hang around with in school, and every single day she talks about her old best friends from another school, And one day it really frustrated me when she said she just uses me as someone to hang around with, and I said back to her, Well if you dont think of me as anything, why should i like you back, Out of complete frustration, and she flipped out, and started calling me the worst things, Horrible things (too rude to put on here! ) And I said Im soo sorry, Just because my phone was constantly bleeping with the texts from her with abuse on them, and I was in tears, and she said, "once a jealous b***h always a jealous b****h, Then it got worse, and The texts wouldnt stop, Eventually i said, Why should i even bother with you, You have brought this mess upon yourself and you're going to end up alone...... Then after about 10 mins she said im sorry, and I was like ok x, and she said, Well aren't you going to say it back to me, and I replied i did, Remember and you called me a Jealous b***** and she was like fine, well if you dont apologize i take mine back becos i did nothing wrong, when she was the one sending the texts,..................................… Should i even bother with her, has she just proved she is a rubbish friend??? Or is it up to me..